feat: add code samples for continuous tuning

[yeyuanyyg]

Continuous tuning accepts a model resource name as the base_model and an optional checkpoint ID to run continuous tuning from.

[snippet-bot]

Here is the summary of changes.

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• genai/tuning/continuous_tuning_create.py:17, tag googlegenaisdk_continuous_tuning_create

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[gemini-code-assist]

Summary of Changes

Hello @yeyuanyyg, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the google-genai SDK samples by adding a new example for continuous tuning. This allows developers to fine-tune existing models from a specific checkpoint, enabling iterative model improvement and more efficient resource utilization for machine learning workflows.

Highlights

• New Continuous Tuning Sample: Introduced genai/tuning/continuous_tuning_create.py to demonstrate creating continuous tuning jobs using the google-genai SDK.
• API Usage: The new sample showcases how to use client.tunings.tune with base_model and pre_tuned_model_checkpoint_id for continuous tuning, including a polling mechanism to monitor job progress.
• Dependency Update: The google-genai dependency in genai/tuning/requirements.txt has been updated to version 1.39.1.
• Unit Test Coverage: A new test, test_continuous_tuning_create, was added to genai/tuning/test_tuning_examples.py to ensure the new continuous tuning functionality works as expected with mocked API responses.

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[gemini-code-assist]

Code Review

This pull request adds a new code sample for continuous tuning (continuous_tuning_create.py) and a corresponding test. The changes look good overall, but I have a few suggestions to improve the robustness of the new sample and its test. Specifically, I've pointed out a need for better error handling in the case of a failed tuning job, a minor clarification for a TODO comment, and a way to strengthen the new test to cover the job polling logic.